Assume a Midwestern farm site, which is mostly flat grassland, has a wind-shear coefficient of 0.2 (α = 0.2) and your 50-foot-high anemometer (H1) has recorded an annual average wind speed of 15.6 mph (V1).
What annual average wind speed (V2) can you expect at turbine hub height on a 75-foot tower (H2)?
V2 = V1 |H2/H1| α
V2 = 15.6 mph |75 ft./50 ft.| 0.2
V2 = 16.9 mph